Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N577GJ - Bombardier CRJ 700 701ER - United Express GJS7550/G77550 - 3.6 mi away @ 15875 ft, heading NW at 399 mph. Spotted for first time! [06:51:01 PM CDT] #A76909 #N577GJ #CRJ7 #LINDBERGH #GJS7550 #G77550 #ADSB #ADSBbot